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On I/Q imbalance effects in MIMO space-time coded transmission systems MIMO空时编码传输系统中I/Q不平衡效应研究
2006 IEEE Radio and Wireless Symposium Pub Date : 2006-04-10 DOI: 10.1109/RWS.2006.1615135
M. Valkama, Yaning Zou, M. Renfors
{"title":"On I/Q imbalance effects in MIMO space-time coded transmission systems","authors":"M. Valkama, Yaning Zou, M. Renfors","doi":"10.1109/RWS.2006.1615135","DOIUrl":"https://doi.org/10.1109/RWS.2006.1615135","url":null,"abstract":"Through the introduction of multiple antennas in future wireless communications systems, the requirements for the power consumption, cost and size of individual radio front-ends become even more challenging than in the current single antenna systems. In this context, the so called direct-conversion front-end architecture is of big interest for building compact radios. One practical issue in this context is the so called I/Q imbalance problem related to the amplitude and phase matching of the I and Q branches of each analog front-end. In this paper, we analyze the I/Q imbalance effects in a multiantenna setup and show that I/Q imbalance is relatively even bigger problem in MIMO systems than in their traditional single antenna counterparts. As an example, the basic 2/spl times/1 Alamouti transmit diversity scheme is examined in detail and a closed-form solution for the resulting signal-to-interference ratio at the output of the receiver combining stage is derived as a function of imbalance properties. The obtained results indicate that I/Q imbalance can easily become a limiting factor in multiantenna systems, and should carefully be mitigated using proper analog or digital signal processing. In general, the analysis results are verified using extensive computer simulations.","PeriodicalId":244560,"journal":{"name":"2006 IEEE Radio and Wireless Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130873348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 23
Single-ended ultra-low-power multistage rectifiers for passive RFID tags at UHF and microwave frequencies 用于超高频和微波频率无源RFID标签的单端超低功耗多级整流器
2006 IEEE Radio and Wireless Symposium Pub Date : 2006-04-10 DOI: 10.1109/RWS.2006.1615199
K. Seemann, G. Hofer, F. Cilek, R. Weigel
{"title":"Single-ended ultra-low-power multistage rectifiers for passive RFID tags at UHF and microwave frequencies","authors":"K. Seemann, G. Hofer, F. Cilek, R. Weigel","doi":"10.1109/RWS.2006.1615199","DOIUrl":"https://doi.org/10.1109/RWS.2006.1615199","url":null,"abstract":"The commercial significance of ubiquitous chips, especially of radio frequency identification devices (RFID), and the advantages compared to other identification technologies, for e.g. the barcode, has been discussed in several papers. In order to achieve higher operational distances and to improve the operational reliability of passive RFID tags, the design of integrated circuits with ultra-low power consumption and novel concepts for high-efficiency energy scavenging are an emerging task. This article deals with general limitations and novel systematically design approaches concerning rectification circuits for ultra-low power levels at UHF (ultra high frequencies) and microwave frequencies. By using the presented characteristic parameters it is possible to optimize multi-stage rectifiers at the ultra-low power domain and to verify the applicability of a given solid-state and assembly technology.","PeriodicalId":244560,"journal":{"name":"2006 IEEE Radio and Wireless Symposium","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133374530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 28
An active integrated circuit wireless interference cancellation solution 一个有源集成电路无线干扰消除解决方案
2006 IEEE Radio and Wireless Symposium Pub Date : 2006-04-10 DOI: 10.1109/RWS.2006.1615218
J. Laskar, A. Raghavan, Chang-Ho Lee, E. Gebara, M. Tentzeris, T. Stelliga
{"title":"An active integrated circuit wireless interference cancellation solution","authors":"J. Laskar, A. Raghavan, Chang-Ho Lee, E. Gebara, M. Tentzeris, T. Stelliga","doi":"10.1109/RWS.2006.1615218","DOIUrl":"https://doi.org/10.1109/RWS.2006.1615218","url":null,"abstract":"This paper proposes a novel active interference cancellation system that allows simultaneous operation of multi-standard collocated radios. This method can be extended to other mutually interfering radio devices. A reference signal correlated to the original interferer is used to generate a cancellation signal by means of amplitude and phase alignment, and filtration. The filter employed emulates the coupling channel responsible for interference. An implementation of this procedure in 0.18 micrometer Si-CMOS IC technology is also presented. The circuits fabricated are tunable and are controlled externally by a closed loop adaptive process including an error minimization method. The cancellation system designed achieves 15-30 dB of interference suppression for different cases. A total power of 14 mW is dissipated by the CMOS ICs designed.","PeriodicalId":244560,"journal":{"name":"2006 IEEE Radio and Wireless Symposium","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133459384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Multi-GSPS all-optical ADC for direct digital receivers 用于直接数字接收机的多gsps全光ADC
2006 IEEE Radio and Wireless Symposium Pub Date : 2006-04-10 DOI: 10.1109/RWS.2006.1615198
Xiaobo Hou, A. Daryoush, W. Rosen
{"title":"Multi-GSPS all-optical ADC for direct digital receivers","authors":"Xiaobo Hou, A. Daryoush, W. Rosen","doi":"10.1109/RWS.2006.1615198","DOIUrl":"https://doi.org/10.1109/RWS.2006.1615198","url":null,"abstract":"Multi-beam phased array antennas are employed in wireless communications, where RF direct down-conversion, timing synchronization, and analog-to-digital are of important functions. Design of a novel all-optical ADC using spectral technique is presented, where sampling speeds as high as 40 GSPS with 6 bits of resolution is attainable.","PeriodicalId":244560,"journal":{"name":"2006 IEEE Radio and Wireless Symposium","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130021024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
A weighted sum of Gaussian-derived pulse design for UWB 一种加权和的超宽带高斯脉冲设计
2006 IEEE Radio and Wireless Symposium Pub Date : 2006-04-10 DOI: 10.1109/RWS.2006.1615175
H. Ray, N. Udar, R. Viswanathan
{"title":"A weighted sum of Gaussian-derived pulse design for UWB","authors":"H. Ray, N. Udar, R. Viswanathan","doi":"10.1109/RWS.2006.1615175","DOIUrl":"https://doi.org/10.1109/RWS.2006.1615175","url":null,"abstract":"With 7.5 GHz of spectrum, ultra wide band (UWB) is an ideal candidate for achieving high data rates over short distances with low cost and low power consumption. In this paper, we propose a simple pulse design method that uses a linear combination of two Gaussian derivatives to meet the FCC spectral mask requirements. With distance and data rate analysis, it is demonstrated that the proposed pulse design is efficient as compared to previously proposed standard Gaussian monocycles. In quest of making UWB a universal standard, the proposed pulse is shown to satisfy the ETSI proposed UWB spectral requirements.","PeriodicalId":244560,"journal":{"name":"2006 IEEE Radio and Wireless Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130174852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
MEMS-switched class-A-to-E reconfigurable power amplifier mems开关a -to- e类可重构功率放大器
2006 IEEE Radio and Wireless Symposium Pub Date : 2006-04-10 DOI: 10.1109/RWS.2006.1615140
P. Bell, Z. Popovic, C. Dyck
{"title":"MEMS-switched class-A-to-E reconfigurable power amplifier","authors":"P. Bell, Z. Popovic, C. Dyck","doi":"10.1109/RWS.2006.1615140","DOIUrl":"https://doi.org/10.1109/RWS.2006.1615140","url":null,"abstract":"Reconfigurable microwave power amplifiers are essential components of multifunctional front-ends. This paper discusses the design and demonstration of a MEMS-reconfigurable power amplifier at 10 GHz that functions in either a linear class-A mode or a high-efficiency class-E mode. The measured performance is compared to non-reconfigurable class-A and -E amplifiers on the same substrate. The reconfigurable output network is designed such that the decrease in efficiency due to the additional output loss is no more than 5% when compared to a non-reconfigurable circuit. Both modes achieve 20 dBm output power, with 24% power-added efficiency and 26.6% drain efficiency at the 1 dB compression point in class-A mode, and 49% power-added efficiency and 58.3% drain efficiency in the class-E mode.","PeriodicalId":244560,"journal":{"name":"2006 IEEE Radio and Wireless Symposium","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131985167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
The convergence of broadcasting and the Internet for broadband wide area interactive television and Internet multimedia services 广播与互联网的融合，用于宽带广域互动电视和互联网多媒体业务
2006 IEEE Radio and Wireless Symposium Pub Date : 2006-04-10 DOI: 10.1109/RWS.2006.1615197
D. Prendergast, Yiyan Wu
{"title":"The convergence of broadcasting and the Internet for broadband wide area interactive television and Internet multimedia services","authors":"D. Prendergast, Yiyan Wu","doi":"10.1109/RWS.2006.1615197","DOIUrl":"https://doi.org/10.1109/RWS.2006.1615197","url":null,"abstract":"In this paper, we describe how telecom and transmission technologies could be used to offer interactive television (ITV) and Internet multimedia service (IMS). We propose to use the ATSC-DTV system for the downlink and DVB-RCT standard to implement the wireless return channel. This paper also presents some technical aspects of the system implementation.","PeriodicalId":244560,"journal":{"name":"2006 IEEE Radio and Wireless Symposium","volume":"229 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133545391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Performance of multicode DS/CDMA with noncoherent M-ary orthogonal modulation and parallel interference cancellation 非相干正交调制和并行干扰消除的多码DS/CDMA性能
2006 IEEE Radio and Wireless Symposium Pub Date : 2006-04-10 DOI: 10.1109/RWS.2006.1615125
C. Iskander
{"title":"Performance of multicode DS/CDMA with noncoherent M-ary orthogonal modulation and parallel interference cancellation","authors":"C. Iskander","doi":"10.1109/RWS.2006.1615125","DOIUrl":"https://doi.org/10.1109/RWS.2006.1615125","url":null,"abstract":"We derive an approximation for the bit error rate of uplink multicode direct-sequence code-division multiple-access (DS/CDMA) with noncoherent M-ary modulation in multipath fading channels, when parallel interference cancellation is used at the equal-gain combining receiver. The analysis takes into account the effect of incorrect decisions and the fact that all codes of a multicode user fade along the same propagation path.","PeriodicalId":244560,"journal":{"name":"2006 IEEE Radio and Wireless Symposium","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133140914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
An immediate capacity enhancement in a WCDMA network using multiple path connections 在使用多路径连接的WCDMA网络中立即增强容量
2006 IEEE Radio and Wireless Symposium Pub Date : 2006-04-10 DOI: 10.1109/RWS.2006.1615111
Dahmmaet Bunnjaweht, M. Wickert
{"title":"An immediate capacity enhancement in a WCDMA network using multiple path connections","authors":"Dahmmaet Bunnjaweht, M. Wickert","doi":"10.1109/RWS.2006.1615111","DOIUrl":"https://doi.org/10.1109/RWS.2006.1615111","url":null,"abstract":"Next generations of wireless systems are designed for multimedia communication, with a wide range of data types and rates all sharing the same wireless infrastructure. In order to provide services with high capacity and desired quality of service, the system requires efficient resource allocation. In this paper we study the physical layer multiple path connections (MPC) scenario in a wideband code division multiple access (WCDMA) network. Under the limited radio resource, we investigate an opportunity-driven multiple connections scheme for resource sharing. The results obtained are encouraging. Even with a simple algorithm, capacity improvement is obtained from the proposed scheme.","PeriodicalId":244560,"journal":{"name":"2006 IEEE Radio and Wireless Symposium","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121726068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
RF CMOS transceiver for 802.15.4 SoC 用于802.15.4 SoC的RF CMOS收发器
2006 IEEE Radio and Wireless Symposium Pub Date : 2006-04-10 DOI: 10.1109/RWS.2006.1615222
H. Barthélemy, S. Bourdel, N. Dehaese, M. Egels, J. Gaubert, P. Pannier, G. Bas
{"title":"RF CMOS transceiver for 802.15.4 SoC","authors":"H. Barthélemy, S. Bourdel, N. Dehaese, M. Egels, J. Gaubert, P. Pannier, G. Bas","doi":"10.1109/RWS.2006.1615222","DOIUrl":"https://doi.org/10.1109/RWS.2006.1615222","url":null,"abstract":"Feasibility of low cost 2.4 GHz RF CMOS transceiver for the 802.15.4 standard is demonstrated. The system architecture and its constitutive blocs are designed to achieve low cost and low power consumption. The implementation in a 0.28 /spl mu/m standard CMOS process and the packaging methodology to reduce the digital noise is also presented and discussed.","PeriodicalId":244560,"journal":{"name":"2006 IEEE Radio and Wireless Symposium","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122330250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
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